“It is foolish to answer a question that you do not understand. It is sad to work for an end that you do not desire— George Polya [1]}.
According to Mathematician Polya's famous problem solving heuristics, asking general common sense questions about the problem facilitates problem understanding. One such question is “What is the unknown?" [1]}. The unknown of a given problem is what the problem requires to be worked out and solved. In this paper, we propose computational models for extracting the unknown from problem specifications.
